1 John is written to Gnostic Jews??

1 John is written to Gnostic Jews?? Ok, if they exists, Jews (not exactly a large community) + Gnostic (a Rarity), is not exactly a huge audience. May I ask, what is 1 John doing here, being Canonized as a Christian bible, written for a minority group, and not relevant to the rest of the world?? Even if it's written to Jews, It has to be relevant to us, and if its relevant to us, it's important to read and understand it!

I John 1:6-10 NKJV

If we say that we have fellowship with Him, and walk in darkness, we lie and do not practice the truth. But if we walk in the light as He is in the light, we have fellowship with one another, and the blood of Jesus Christ His Son cleanses us from all sin. If we say that we have no sin, we deceive ourselves, and the truth is not in us. If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness. If we say that we have not sinned, we make Him a liar, and His word is not in us.

I John 2:3-6 NKJV

Now by this we know that we know Him, if we keep His commandments. He who says, “I know Him,” and does not keep His commandments, is a liar, and the truth is not in him. But whoever keeps His word, truly the love of God is perfected in him. By this we know that we are in Him. He who says he abides in Him ought himself also to walk just as He walked.

One lie leads to another, the Grace doctrine just doesn't hold up. Take heed!